DTC codes
Look up an OBD-II fault code: what it means on every car or on your make, and how to track it down.
How to read a code
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 4
- AreaAuxiliary emission controls
- 20
- FaultThe specific fault in that area
Read the code
Note every stored and pending code your scanner shows, such as P0420.
Find it
Search by code or by words. For a manufacturer code (P1, B1, C1, U1) pick your make: its meaning differs by make.
Open the code
Its page explains the symptoms, likely causes, the checks to run and the fixes.
- P1704Lincoln · PowertrainTransmission System Problems
- P1704Mercury · PowertrainTransmission system problems
- P1704Other · PowertrainDigital TRS Failed to Transition States in KOEO / KOER
- P1704Subaru · Powertrain2-4 Brake Timing Solenoid Valve Circuit Malfunction
- P1704Volkswagen · PowertrainKick Down Switch Malfunction
- P1705Acura · PowertrainTCM A/T Gear Position Switch Circuit Shorted
- P1705Buick · PowertrainP/N Signal Output Circuit
- P1705Cadillac · PowertrainP/N Signal Output Circuit
- P1705Chevrolet · PowertrainP/N Signal Output Circuit
- P1705Ford · PowertrainManual Lever Position Sensor Out of Self-Test Range
- P1705GM · PowertrainP/N Signal Output Circuit
- P1705GMC · PowertrainP/N Signal Output Circuit
- P1705Honda · PowertrainTCM A/T Gear Position Switch Circuit Shorted
- P1705Infiniti · PowertrainTCM A/T Gear Position Switch Circuit Shorted
- P1705Lexus · PowertrainDirect Clutch Speed Circuit Fault
- P1705Lincoln · PowertrainManual Lever Position Sensor Out of Self-Test Range
- P1705Mazda · PowertrainTransmission Range Sensor Out Of Self Test Range
- P1705Mercedes-Benz · PowertrainStarter Lock-Out Backup Lamp Switch S161
- P1705Mercury · PowertrainManual Lever Position Sensor Out of Self-Test Range
- P1705Nissan · PowertrainThrottle Position Sensor Circuit AT
- P1705Oldsmobile · PowertrainP/N Signal Output Circuit
- P1705Other · PowertrainNot in P or N During KOEO / KOER
- P1705Saturn · PowertrainP/N Signal Output Circuit
- P1705Subaru · Powertrain2-4 Brake Pressure Solenoid Valve Solenoid D Circuit
- P1705Suzuki · PowertrainTCM ECT Sensor Circuit Fault
- P1705Toyota · PowertrainDirect Clutch Speed Circuit Fault
- P1706Acura · PowertrainTCM A/T Gear Position Switch Circuit Open
- P1706Ford · PowertrainHigh Vehicle Speed Observed in Park
- P1706Honda · PowertrainTCM A/T Gear Position Switch Circuit Open
- P1706Infiniti · PowertrainTCM A/T Gear Position Switch Circuit Open